date-options / calendar-featrue (2 posts)

hi guys,
i am working around with WP for a few days now - ich can already use it as my blog and i am doing some test using it as a CMS.
i found two features, that would be nice to have in the core system:
-- the first is the opportunity to set publishing-times for posts/pages like "visible from xx/xx/xxxx to yy/yy/yyyy" or "the next 3 wseeks" (i know the from does work, but i didnt find the to - if there is one ...)
-- if there were a somelike feature like the above, one could easily manage to get an event.calender online ...